Add ArtistSerializer to music serializers file

This commit adds ArtistSerializer to the music/serializers.py file. This serializer class will be used to control how Artist model instances are converted to and validated against JSON data. It currently specifies 'name' as the only field to be serialized.

first_api/music/serializers.py

@@ -0,0 +1,9 @@
+from rest_framework import serializers
+
+from music.models import Artist
+
+
+class ArtistSerializer(serializers.HyperlinkedModelSerializer):
+    class Meta:
+        model = Artist
+        fields = ['name']